Hi, I would completely erase the OSGeo4w64 folder and try a reinstall and make sure the antivirus is not interfering. If that does not work, hunt down other directories where QGIS files are found like in the user profile. You can also destroy the registry keys. You could also try with the other QGIS installer. Make sure you run the installer in admin mode. Ideas can be found here. This was for QGIS 2.x.
https://gis.stackexchange.com/questions/152873/how-to-completely-uninstall-and-remove-qgis-2-8-1-on-windows-vista Nicolas > Le 12 mars 2019 à 02:10, Jana Michalková <[email protected]> a écrit : > > Hello all, > > I would need little help from you. One of my student has a problem with > QGIS on Windows. After the last QGIS shutdown Windows got an error message > The code execution cannot proceed because qgis_app.dll was not found (and > another ones see below) and he can not run QGIS from this moment. He > attempted to reinstall it, we also tried to use this tip and this, but > nothing worked. It still does not complete the installation and will not > create icons on the desktop nor in the start menu. He tried to install > different qgis versions (3.6, 3.4, 2.18, 2.18, 2.14). It worked only for > version 1.xx. > > PC parameters: Acer Nitro 5, OS Windows 10 Home 64bit, 8 GB RAM, Intel Core > i5-8300H 2.30 GHz, GeForce GTX 1050 4GB. > > Where could be a problem? > Thanks in advance for any help! > > Best regards > Jana > > -- > Mgr. Jana Michalková, PhD. > Researcher > ERASMUS+ Departmental Coordinator > > Department of Geography and Applied Geoinformatics > Faculty of Humanities and Natural Sciences > University of Presov > 17. novembra 1, 081 16 Presov, Slovakia > > > <Error_version_3.png> > <Errors_version_2.png> > _______________________________________________ > Qgis-user mailing list > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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